| 摘要 |
A sensor circuit (18) for detecting light hazards or bright light sources that will cause discomfort. The sensor circuit (18) includes a pair of detector circuits (200, 201), each of which includes a sensitivity feedback circuit (221) an a comparator circuit (22), which are electrically connected together via lines (202, 203) to inputs of a NAND gate (204). The sensor and sensor electronics provide a wide sensitivity range, which is fully automatically adjustable, and which has the ability to detect points source of light. The sensor further has the ability to distinguish low power stable light generated from a small welding arc from bright ambient light or even direct sunlight. |
